4 * This contains a simple multithreaded TCP server manager. It sits around
5 * waiting on the specified port for incoming HTTP connections. When a
6 * connection is established, it calls context_loop() from context_loop.c.
12 #include "webserver.h"
15 int vsnprintf(char *buf, size_t max, const char *fmt, va_list argp);
18 int verbosity = 9; /* Logging level */
19 int msock; /* master listening socket */
20 int is_https = 0; /* Nonzero if I am an HTTPS service */
21 int follow_xff = 0; /* Follow X-Forwarded-For: header */
22 extern void *context_loop(int);
23 extern void *housekeeping_loop(void);
24 extern pthread_mutex_t SessionListMutex;
25 extern pthread_key_t MyConKey;
28 char *server_cookie = NULL;
31 char *ctdlhost = DEFAULT_HOST;
32 char *ctdlport = DEFAULT_PORT;
34 char wizard_filename[PATH_MAX];
37 * This is a generic function to set up a master socket for listening on
38 * a TCP port. The server shuts down if the bind fails.
40 int ig_tcp_server(char *ip_addr, int port_number, int queue_len)
42 struct sockaddr_in sin;
45 memset(&sin, 0, sizeof(sin));
46 sin.sin_family = AF_INET;
47 if (ip_addr == NULL) {
48 sin.sin_addr.s_addr = INADDR_ANY;
50 sin.sin_addr.s_addr = inet_addr(ip_addr);
53 if (sin.sin_addr.s_addr == INADDR_NONE) {
54 sin.sin_addr.s_addr = INADDR_ANY;
57 if (port_number == 0) {
58 lprintf(1, "Cannot start: no port number specified.\n");
61 sin.sin_port = htons((u_short) port_number);
63 s = socket(PF_INET, SOCK_STREAM, (getprotobyname("tcp")->p_proto));
65 lprintf(1, "Can't create a socket: %s\n", strerror(errno));
68 /* Set some socket options that make sense. */
70 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
72 if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
73 lprintf(1, "Can't bind: %s\n", strerror(errno));
76 if (listen(s, queue_len) < 0) {
77 lprintf(1, "Can't listen: %s\n", strerror(errno));
86 * Create a Unix domain socket and listen on it
88 int ig_uds_server(char *sockpath, int queue_len)
90 struct sockaddr_un addr;
95 actual_queue_len = queue_len;
96 if (actual_queue_len < 5) actual_queue_len = 5;
99 if (i != 0) if (errno != ENOENT) {
100 lprintf(1, "citserver: can't unlink %s: %s\n",
101 sockpath, strerror(errno));
105 memset(&addr, 0, sizeof(addr));
106 addr.sun_family = AF_UNIX;
107 safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
109 s = socket(AF_UNIX, SOCK_STREAM, 0);
111 lprintf(1, "citserver: Can't create a socket: %s\n",
116 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
117 lprintf(1, "citserver: Can't bind: %s\n",
122 if (listen(s, actual_queue_len) < 0) {
123 lprintf(1, "citserver: Can't listen: %s\n",
128 chmod(sockpath, 0777);
136 * Read data from the client socket.
138 * 1 Requested number of bytes has been read.
139 * 0 Request timed out.
140 * -1 Connection is broken, or other error.
142 int client_read_to(int sock, char *buf, int bytes, int timeout)
152 return (client_read_ssl(buf, bytes, timeout));
157 while (len < bytes) {
163 retval = select((sock) + 1, &rfds, NULL, NULL, &tv);
164 if (FD_ISSET(sock, &rfds) == 0) {
168 rlen = read(sock, &buf[len], bytes - len);
171 lprintf(2, "client_read() failed: %s\n",
179 write(2, "\033[32m", 5);
180 write(2, buf, bytes);
181 write(2, "\033[30m", 5);
187 ssize_t client_write(const void *buf, size_t count)
190 if (WC->burst != NULL) {
192 realloc(WC->burst, (WC->burst_len + count + 2));
193 memcpy(&WC->burst[WC->burst_len], buf, count);
194 WC->burst_len += count;
199 client_write_ssl((char *) buf, count);
204 write(2, "\033[34m", 5);
205 write(2, buf, count);
206 write(2, "\033[30m", 5);
208 return (write(WC->http_sock, buf, count));
212 void begin_burst(void)
214 if (WC->burst != NULL) {
219 WC->burst = malloc(SIZ);
224 * compress_gzip() uses the same calling syntax as compress2(), but it
225 * creates a stream compatible with HTTP "Content-encoding: gzip"
228 #define DEF_MEM_LEVEL 8
229 #define OS_CODE 0x03 /* unix */
230 int ZEXPORT compress_gzip(Bytef * dest, uLongf * destLen,
231 const Bytef * source, uLong sourceLen, int level)
233 const int gz_magic[2] = { 0x1f, 0x8b }; /* gzip magic header */
235 /* write gzip header */
236 sprintf((char *) dest, "%c%c%c%c%c%c%c%c%c%c",
237 gz_magic[0], gz_magic[1], Z_DEFLATED,
238 0 /*flags */ , 0, 0, 0, 0 /*time */ , 0 /*xflags */ ,
244 stream.next_in = (Bytef *) source;
245 stream.avail_in = (uInt) sourceLen;
246 stream.next_out = dest + 10L; // after header
247 stream.avail_out = (uInt) * destLen;
248 if ((uLong) stream.avail_out != *destLen)
251 stream.zalloc = (alloc_func) 0;
252 stream.zfree = (free_func) 0;
253 stream.opaque = (voidpf) 0;
255 err = deflateInit2(&stream, level, Z_DEFLATED, -MAX_WBITS,
256 DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
260 err = deflate(&stream, Z_FINISH);
261 if (err != Z_STREAM_END) {
263 return err == Z_OK ? Z_BUF_ERROR : err;
265 *destLen = stream.total_out + 10L;
267 /* write CRC and Length */
268 uLong crc = crc32(0L, source, sourceLen);
270 for (n = 0; n < 4; ++n, ++*destLen) {
271 dest[*destLen] = (int) (crc & 0xff);
274 uLong len = stream.total_in;
275 for (n = 0; n < 4; ++n, ++*destLen) {
276 dest[*destLen] = (int) (len & 0xff);
279 err = deflateEnd(&stream);
289 if (WC->burst == NULL)
292 the_len = WC->burst_len;
293 the_data = WC->burst;
299 /* Handle gzip compression */
301 char *compressed_data = NULL;
302 uLongf compressed_len;
304 compressed_len = (uLongf) ((the_len * 101) / 100) + 100;
305 compressed_data = malloc(compressed_len);
307 if (compress_gzip((Bytef *) compressed_data,
310 (uLongf) the_len, Z_BEST_SPEED) == Z_OK) {
311 wprintf("Content-encoding: gzip\r\n");
313 the_data = compressed_data;
314 the_len = compressed_len;
316 free(compressed_data);
319 #endif /* HAVE_ZLIB */
321 wprintf("Content-length: %d\r\n\r\n", the_len);
322 client_write(the_data, the_len);
330 * Read data from the client socket with default timeout.
331 * (This is implemented in terms of client_read_to() and could be
332 * justifiably moved out of sysdep.c)
334 int client_read(int sock, char *buf, int bytes)
336 return (client_read_to(sock, buf, bytes, SLEEPING));
341 * client_getln() ... Get a LF-terminated line of text from the client.
342 * (This is implemented in terms of client_read() and could be
343 * justifiably moved out of sysdep.c)
345 int client_getln(int sock, char *buf, int bufsiz)
349 /* Read one character at a time.
352 retval = client_read(sock, &buf[i], 1);
353 if (retval != 1 || buf[i] == '\n' || i == (bufsiz-1))
357 /* If we got a long line, discard characters until the newline.
360 while (buf[i] != '\n' && retval == 1)
361 retval = client_read(sock, &buf[i], 1);
364 * Strip any trailing non-printable characters.
367 while ((strlen(buf) > 0) && (!isprint(buf[strlen(buf) - 1]))) {
368 buf[strlen(buf) - 1] = 0;
375 * Start running as a daemon. Only close stdio if do_close_stdio is set.
377 void start_daemon(int do_close_stdio)
379 if (do_close_stdio) {
384 signal(SIGHUP, SIG_IGN);
385 signal(SIGINT, SIG_IGN);
386 signal(SIGQUIT, SIG_IGN);
391 void spawn_another_worker_thread()
393 pthread_t SessThread; /* Thread descriptor */
394 pthread_attr_t attr; /* Thread attributes */
397 lprintf(3, "Creating a new thread\n");
399 /* set attributes for the new thread */
400 pthread_attr_init(&attr);
401 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
403 /* Our per-thread stacks need to be bigger than the default size, otherwise
404 * the MIME parser crashes on FreeBSD, and the IMAP service crashes on
407 if ((ret = pthread_attr_setstacksize(&attr, 1024 * 1024))) {
408 lprintf(1, "pthread_attr_setstacksize: %s\n",
410 pthread_attr_destroy(&attr);
413 /* now create the thread */
414 if (pthread_create(&SessThread, &attr,
415 (void *(*)(void *)) worker_entry, NULL)
417 lprintf(1, "Can't create thread: %s\n", strerror(errno));
420 /* free up the attributes */
421 pthread_attr_destroy(&attr);
425 * Here's where it all begins.
427 int main(int argc, char **argv)
429 pthread_t SessThread; /* Thread descriptor */
430 pthread_attr_t attr; /* Thread attributes */
431 int a, i; /* General-purpose variables */
432 int port = PORT_NUM; /* Port to listen on */
433 char tracefile[PATH_MAX];
435 char *webcitdir = WEBCITDIR;
439 #endif /* ENABLE_NLS */
440 char uds_listen_path[PATH_MAX]; /* listen on a unix domain socket? */
442 strcpy(uds_listen_path, "");
444 /* Parse command line */
446 while ((a = getopt(argc, argv, "h:i:p:t:x:cfs")) != EOF)
448 while ((a = getopt(argc, argv, "h:i:p:t:x:cf")) != EOF)
452 webcitdir = strdup(optarg);
455 safestrncpy(ip_addr, optarg, sizeof ip_addr);
460 safestrncpy(uds_listen_path, optarg, sizeof uds_listen_path);
464 safestrncpy(tracefile, optarg, sizeof tracefile);
465 freopen(tracefile, "w", stdout);
466 freopen(tracefile, "w", stderr);
467 freopen(tracefile, "r", stdin);
470 verbosity = atoi(optarg);
476 server_cookie = malloc(256);
477 if (server_cookie != NULL) {
478 safestrncpy(server_cookie,
479 "Set-cookie: wcserver=",
482 (&server_cookie[strlen(server_cookie)],
484 lprintf(2, "gethostname: %s\n",
494 fprintf(stderr, "usage: webserver "
495 "[-i ip_addr] [-p http_port] "
496 "[-t tracefile] [-c] [-f] "
500 "[remotehost [remoteport]]\n");
505 ctdlhost = argv[optind];
507 ctdlport = argv[optind];
509 /* Tell 'em who's in da house */
510 lprintf(1, SERVER "\n");
511 lprintf(1, "Copyright (C) 1996-2005 by the Citadel development team.\n"
512 "This software is distributed under the terms of the "
513 "GNU General Public License.\n\n"
516 lprintf(9, "Changing directory to %s\n", webcitdir);
517 if (chdir(webcitdir) != 0) {
521 /* initialize the International Bright Young Thing */
524 initialize_locales();
526 locale = setlocale(LC_ALL, "");
528 mo = malloc(strlen(webcitdir) + 20);
529 sprintf(mo, "%s/locale", webcitdir);
530 lprintf(9, "Message catalog directory: %s\n",
531 bindtextdomain("webcit", mo)
534 lprintf(9, "Text domain: %s\n",
537 lprintf(9, "Text domain Charset: %s\n",
538 bind_textdomain_codeset("webcit","UTF8")
542 initialize_viewdefs();
546 * Set up a place to put thread-specific data.
547 * We only need a single pointer per thread - it points to the
548 * wcsession struct to which the thread is currently bound.
550 if (pthread_key_create(&MyConKey, NULL) != 0) {
551 lprintf(1, "Can't create TSD key: %s\n", strerror(errno));
555 * Set up a place to put thread-specific SSL data.
556 * We don't stick this in the wcsession struct because SSL starts
557 * up before the session is bound, and it gets torn down between
561 if (pthread_key_create(&ThreadSSL, NULL) != 0) {
562 lprintf(1, "Can't create TSD key: %s\n", strerror(errno));
567 * Bind the server to our favorite port.
568 * There is no need to check for errors, because ig_tcp_server()
569 * exits if it doesn't succeed.
572 if (strlen(uds_listen_path) > 0) {
573 lprintf(2, "Attempting to create listener socket at %s...\n", uds_listen_path);
574 msock = ig_uds_server(uds_listen_path, LISTEN_QUEUE_LENGTH);
577 lprintf(2, "Attempting to bind to port %d...\n", port);
578 msock = ig_tcp_server(ip_addr, port, LISTEN_QUEUE_LENGTH);
581 lprintf(2, "Listening on socket %d\n", msock);
582 signal(SIGPIPE, SIG_IGN);
584 pthread_mutex_init(&SessionListMutex, NULL);
587 * Start up the housekeeping thread
589 pthread_attr_init(&attr);
590 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
591 pthread_create(&SessThread, &attr,
592 (void *(*)(void *)) housekeeping_loop, NULL);
596 * If this is an HTTPS server, fire up SSL
604 /* Start a few initial worker threads */
605 for (i = 0; i < (MIN_WORKER_THREADS); ++i) {
606 spawn_another_worker_thread();
609 /* now the original thread becomes another worker */
616 * Entry point for worker threads
618 void worker_entry(void)
623 int fail_this_transaction = 0;
626 /* Only one thread can accept at a time */
627 fail_this_transaction = 0;
628 ssock = accept(msock, NULL, 0);
630 lprintf(2, "accept() failed: %s\n",
633 /* Set the SO_REUSEADDR socket option */
635 setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR,
638 /* If we are an HTTPS server, go crypto now. */
641 if (starttls(ssock) != 0) {
642 fail_this_transaction = 1;
648 if (fail_this_transaction == 0) {
649 /* Perform an HTTP transaction... */
651 /* ...and close the socket. */
652 lingering_close(ssock);
657 } while (!time_to_die);
663 int lprintf(int loglevel, const char *format, ...)
667 if (loglevel <= verbosity) {
668 va_start(ap, format);
669 vfprintf(stderr, format, ap);